Micro – Electric
Multiposition Valve Actuator
Installation and Use
The microprocessor-based multiposition actuator consists of the control module, the stepper motor/
gearbox assembly, a manual controller (use is optional), a 110 or 220VAC to 24VDC power supply,
and the interconnecting cables.
Connections
Figure 2 shows the functions of the cables suppled with the actuator. There are four connectors on
the control module, keyed and sized to prevent incorrect connection.
Input power (20 – 30 VDC, with 24 – 28 VDC preferred) is supplied through a four-pin connector:
pins 1 and 2 are positive inputs; 3 and 4 are negative. The four wires of the power supply cable are
functionally paired to provide the lowest possible impedance. We strongly recommend that all four
wires be connected to the power supply source to prevent any loss of torque. Average DC current
requirement is 2.5 amps, with transient peaks as high as 4 amps. Standby current draw is less than
100 milliamps.
NOTE: Noise-sensitive electronics may experience problems when sharing the 24V power supply
with the actuator.
4.44"
2.2"
1.2"
1"
.75"
1.95"
1"
2.275"
1.375"
(Clamp ring)
.9"
8-32
MOUNTING
HOLES*
Figure 1: Mounting dimensions
Technical Note 415
Valco Instruments Co. Inc.
